Here are some clues:
1. It involved many people marching due to a bad economy.
2. It involved three of America's greatest military hero's: Gen. Douglas MacArthur, then Maj. George S. Patton, and Dwight D. Eisenhower.
3. It can be compared to the Tiananmen Square protests of 1989.

If I remember correctly, it was when WWI veterans were to receive a bonus from the US government, which was granted in the 20's. The vets were not entitled to receive the bonus until 1944 or 45. When the Great Depression struck, the vets marched on D.C. demanding their bonus immediately (I am pretty sure this was in 1932).

In this instance, the men listed under clue # 2, were the "enemy" and conquered the Bonus Army.

I am a war buff (especially WWII), but in my 2nd semester of US HIstory (I was a History major before switching to Mathematics), I had a great professor who hit on this topic. He would lecture every class without a book or notes, he would come into class and sit down (he was handicapped) and just begin lecturing off the top of his head. I had never heard of it before his class, so I got a bit more info about it after his lecture.

Do you think it is often overlooked or not mentioned because of the people that were involved in disbanding the vets?

I think it is overlooked because this is one of the best examples of where our government turned on its citizens, war veterans no less! Then to compound the problem, many of our greatest Generals were directly involved.